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How To Setup Two or More Routers Together (Port Forwarding & Port Triggering)

One of the most common issues people encounter is when they have more than
one router hooked up. Sometimes people don't realize their modem is also a
router (Such as DSL) and other times people hook up an extra router to use
things their router/modem doesn't have, such as wireless.

So now with 2 or more routers hooked up people start to realize port
forwarding & port triggering isn't working. This is because they are only
setting up the port forwarding or triggering in one router, which is what they
should be doing! Now let me explain, no one wants to setup port forwarding &
triggering rules in two or more routers, they should only need to do it in one,
making things simple. But you may ask "If I have more than one router how can I
keep it simple?" The answer: DMZ

First off DMZ is supported by nearly every router/modem out there. What DMZ
does is allow you to tell the router to forward all incoming connections to a
single IP address. So in this case we will setup DMZ in the first router to
point to the second router. Now all incoming connections are sent to the 2nd
router and thus your port forwarding & triggering will work again.

So here is a quick example. I log into router 1 and go to the DMZ settings
and put the WAN IP address of the 2nd router there. Now router 1 is out of the
way for port forwarding and triggering as all incoming connections are now being
forwarded to router 2. Now in router 2 I can setup my port forwarding &
triggering rules just like normal.

So here is a quick step by step.Step 1. Login into your RouterStep 2. Find the status page that shows the WAN/Internet IP address and write it
down. (The Gateway IP will be the IP needed to log into the first router/modem.)Step 3. Log into the first router/modem now.Step 4. Find the DMZ pageStep 5. Enter the IP you wrote down into the DMZ page and enable DMZ.Step 6. Save and your done.

Quick Tip: You should setup a static WAN IP address for
router 2. If you leave it on DHCP the IP could change thus breaking the DMZ and
of course breaking the port forwarding & triggering. This doesn't happen
very often, but it is always a possibility.